EARTH FAULT DETECTING DEVICE, AND ELECTRICITY STORAGE SYSTEM

    公开(公告)号:US20190219621A1

    公开(公告)日:2019-07-18

    申请号:US16326327

    申请日:2017-10-16

    Inventor: NAOHISA MORIMOTO

    CPC classification number: G01R27/18 B60L3/00 G01R31/02 G01R31/025

    Abstract: A capacitor is connected between an output terminal of an impedance element and an electricity storage unit mounted in a vehicle, and the electricity storage unit is electrically insulated from a chassis of the vehicle. An earth fault determiner determines that an earth fault occurs, when a detection value based on a peak-to-peak value of a voltage at a node between the impedance element and the capacitor is less than or equal to a first reference value and more than or equal to a second reference value. The first reference value is set based on the peak-to-peak value of the voltage at the node when an insulation resistance between the electricity storage unit and the chassis of the vehicle is a minimum allowable value. The second reference value is set based on the peak-to-peak value of the voltage at the node when a complete earth fault occurs between the electricity storage unit and the chassis of the vehicle.

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